Carburetor



Patentecl Dec. 11, 1923.

UNITED STATES DWARD J; srivrrson, or NEW YORK, N. Y.

CARBURETOR.

Application filed August 18, 1921. Serial No. 493,228.

To alliwhom it mayco'ncern:

Be it known that I, Enwann J. SiirrsoN, a citizen of the llnited States, and a resi- Vdent of the city of New York, county of Kings, and State of New York, have in- Yented a new and useful Impro-vem'ent in (Jarburetors, of` which thefo-llowing is a specification.

The object of my invention is Vto provide a simple, efiicient, durable and reliable carburetor and this object is accomplished by my invention, one embodimentof which is` i hereinafter more particularly set fo'rth.

For a more detailed description of my invention, referencehis to -be hadzto theaccompanying drawings, forming a part hereof, in which Figure 1 is a plan view of a carburetor embodying my ,invention Figure 2 is a sectional view through the line 2--2 of Figure 1, looking in the direction of the arrows.

vFigures 3, 4 and 5 show details of my novel air valve, 'Figure 4 being a. sectional view on. the line 4-4 of l `igure 3, and Figures 3 and 5 being top and bottom plan views, respectively.

Throughout the various views of the drawings, similar reference characters designate similar parts.

My improved carburetor l has a top casing 2., a fioat chamber 3, a fuel inlet 4, a lioat valve 5, a throttle valve 6 Controlled by a lever 7 and a choice valve 8 Controlled by a lever 9, all of which may be of any suitable construction, but are preferably made substantially as shown; The casing 2 has an extension 10 which is threaded at its bottom tol receive a nut 11 which supports the exterior wall of the float chamber 3 against a washer 12 which is pressed against a collar 13 on the extension 10. The

interior of the extension 10 has a largeV port 14 through which gasoline or other fuel may freely enter into the interior of this projectio'n. The upper end of Jthe projedtion 10 is close by a cup 15 with an eX- tenson 16 at its center which eXtends preferably to just below the level of the port 14. The port 14 is always immersed when the carburetor is in use and gasoline flows through it and up through the extension 16 and into the well 15 where it stands at the float Chamber level.

The upper central portion of the casing 2 is closed by a suitable plate 17 which is held in place by screws 18 and the center of this plate 17 is threaded to receive the, valve stem 19 which hasa perforated plate 20 fixed to its upper end by which it may be turned. The valve 19 is kept from turning too freelyby means of a'split sleeve 21 through which it passes and a nut 22. The split4 screw .is `p-referably formed integral with the plate l The interior of the casing 2 is divided into two parts, one the intake part designated vgenerically by thecharacter 28 and` 'the other, the' outlet, designated by the char- `acter 24.` `These parts are separated by two Vertical partitions 25 and 26 which are connected bya diaphragm 27 which is 'in a plane perpendicular to the spindle 19 and onV this' diaphragm27 rests al fianged air distributing ring 28 which is enlarged near its lower end so as to distribute air evenlyv about the `cupl. The` parts are so connected and designedthat air enters through thepart `23 of the casing an-fl` .passes about.

the vexteriorof the ringf28. and thenceup through the interior of the ring 28, the path being divided in a manner which will now be described.

The lower surface of the plate 17 is provided with a conical projection 29, about which is placed a coil spring 30 which presses on a small dished disc 31 which has three radially disposed arms which are secured by suitable rivets 32 to a funnel The disc 31 has a boss 34 and the funnel 33 a corresponding boss 35, secured thereto by Spider arms 36. These bosses slide freely on the valve stem 19. The upper end of the funnel 33 is flanged at 37 to receive the rivets 32 and to form a secondary valve which will rest on the ring 28.

The ring 28 is kept in place by any suitable means as by a spring wire 88 which rests in a suitable groove in the walls 25 and 26 and above the seat 27.

In view of the foregoing, the operation of my improved carburetor will be readily understood. Air enters through the part .23 and is distributed by the ring 28 about the basin or well 15 where fuel rests according to the float level. When the suction is not very great, that is when the engine to which the carburetor is attached is not using much power, say running at a speed which corresponds to ten miles an hour or less, the suction is not great enoughto raise the funnel 33 and then all the mixture must pass spring 30 is overcome and then the funnel 33 rises so as to open the secondary valve about the fiange 37 and then air enters the Outlet part'll of the casing', both through theffunnel33'and about its exterior. The partsy` ai'el' so arranged and disposed that air' going! about theexterior of the funne1'33`is`noft brought in the' same intimate contact'witliifuel as'the air passing through theiinterior of' the funnel 33 so that although thef suetion is'l'fgreatly' increased the fuel consumption is not disproportionately increased.3-

While have shown-and described one embodiment of my inventiomit-is =obvious that'fitv is not`` restricted thereto, but that it is 1bi'oad enough to? cover all structures that come `'W'ithinltl'ie scope of the a'nnexed claims. Haiving thus described' my invention, Whfat'i'Ilclaimis:

1.;A ca-rbiiretorfh'aving a mixing chamberg' an-a'Iinula'r airfguide 'extending to near the bottomof this'chambeig a Wellfor fuel at the bottomof this Chamber, a funnel.

mountedfins'aid air guidefso asto close the Outlet: ofthe'i same andmeans for holding saidtfiinnel'linsaidA 'air guidefso'that the funnel may be raised more than a predetei'- mined minimum amount of fuelV and air pass through the funnel, whereby additional air and fuel may pass on the exterior of the funnel when it is so raised and the air whether Missing inside or outside of the funnel is rought into intimate contact with the fuel and thoroughly mixed therewith.

2. A carbui'etor comprising a casing having an air inlet, a fuel inlet and a nnxtm'e Outlet, and enclosing a n'iixin'g chamber and a Well surronnding Said fuel inlet, an annular pendant air guide projecting dmvnwal'd close to said Well, and a hollow automatic valve within said air guide forlninclr an annular aii' pass-age between them and also close to said well.l its upper part closing such air passage except when the valve is unseated by suction.

3. A valve for regulating the How of fuel and air through a. carbui'etor comprisingIr a funnel having a flange at its upper end, a disc having a central guiding perforation. and of slightly less diameter than the interior of the funnel fixed to said fiange so as to leave a narrow cii'cular opening between the disc and the funnel and a guiding means at the lower end of the funnel.

In testimony whereof, I have hereunto set my hand and seal this 30 day of July, 1921.

EDWARD J. SIMP SON. 

